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is a significant concern for physicians. Central0 v7 \5 z; j! i2 Z/ t* W
precocious puberty (CPP), which is mediated- ~/ ~7 s( S, V/ r/ m
through the hypothalamic pituitary gonadal axis, has# K: r0 M. C( s: o$ }: U
a higher incidence of organic central nervous system
6 r5 ^1 a4 ]7 F4 _6 P) Flesions in boys.1,2 Virilization in boys, as manifested
+ `7 m) n& p2 Z3 I! ]; k5 ~" nby enlargement of the penis, development of pubic
& }$ ^9 u1 A- ?# Ihair, and facial acne without enlargement of testi-4 F; k/ G) A; g, q( P1 g
cles, suggests peripheral or pseudopuberty.1-3 We
5 A) o1 t. m7 a& Oreport a 16-month-old boy who presented with the+ M6 r# p( g; ?$ u5 y4 N8 w
enlargement of the phallus and pubic hair develop-
q! B A/ Y3 {! j. Nment without testicular enlargement, which was due8 e( r9 X8 K* V1 M* K
to the unintentional exposure to androgen gel used by: K, L) H y& F# i$ b" j: b$ E" P. m
the father. The family initially concealed this infor-: I/ _/ N E. s4 ~9 U# @' n9 b4 I
mation, resulting in an extensive work-up for this- p1 ~) b3 M9 h5 f+ H6 w4 H
child. Given the widespread and easy availability of5 d3 j7 J' E0 ]8 ]+ O3 a
testosterone gel and cream, we believe this is proba-
3 d. H& v5 u2 p" c. A- s1 `bly more common than the rare case report in the* h# p1 W1 y. m s
literature.4
3 K1 F9 Q( J+ ?: v* ~Patient Report2 l0 y, d! Z3 u( [5 t) C) x% S
A 16-month-old white child was referred to the
; v) n9 F1 J8 E& U8 M# c. D. A; ], sendocrine clinic by his pediatrician with the concern! o' m9 l8 z, a5 }' t
of early sexual development. His mother noticed
5 l T; p; T" M6 R' s$ u6 olight colored pubic hair development when he was
- R9 }) v9 n% e# N2 mFrom the 1Division of Pediatric Endocrinology, 2University of4 O2 ]; Y* [& l- _4 ~
South Alabama Medical Center, Mobile, Alabama./ ?' Q% @& D, A
Address correspondence to: Samar K. Bhowmick, MD, FACE,
6 h$ ^0 s1 }" ~+ OProfessor of Pediatrics, University of South Alabama, College of |7 {3 _1 \1 A5 b9 p# O4 n
Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;
9 q" }+ l' N+ @e-mail: [email protected].* V/ E0 w$ k! x4 Q: o6 }
about 6 to 7 months old, which progressively became
9 G# t1 y- f$ S( M3 Fdarker. She was also concerned about the enlarge-
8 f; d, |& K5 L# u/ hment of his penis and frequent erections. The child
: X5 E9 Q l3 owas the product of a full-term normal delivery, with9 G& J/ s# W3 W6 ]9 }. [
a birth weight of 7 lb 14 oz, and birth length of9 O: j' u1 a) e8 n& F: t! D
20 inches. He was breast-fed throughout the first year
1 M& I) \) a- p& [- }: g% j# qof life and was still receiving breast milk along with! }& F# l: X7 a: Q" W4 E! d
solid food. He had no hospitalizations or surgery,6 Z" L0 {" F& U% W* e/ a
and his psychosocial and psychomotor development
9 q+ w6 J0 P# g3 ?7 f+ M3 owas age appropriate.9 A* V/ b+ g1 P5 M, ~. i
The family history was remarkable for the father,6 Q. O* h% W' Z4 E1 u+ Z
who was diagnosed with hypothyroidism at age 16,5 `2 C( K- u9 D9 f4 S- m( t: D
which was treated with thyroxine. The father’s% v* i2 B( z0 r2 }( V* J
height was 6 feet, and he went through a somewhat2 Q9 P6 D( ?% G
early puberty and had stopped growing by age 14.* S1 y- R) g. Y/ P1 t
The father denied taking any other medication. The
: ^7 t' b5 \7 L' [2 G. K+ T! m6 Mchild’s mother was in good health. Her menarche* Q: \$ A1 Z0 S1 J
was at 11 years of age, and her height was at 5 feet
' F1 q0 z7 c3 y B& Q3 |3 V5 inches. There was no other family history of pre-
3 \* }8 [0 W* c2 ]. y' I6 [1 hcocious sexual development in the first-degree rela-* F" u6 n" n8 B
tives. There were no siblings.$ K2 P5 S* t' ]3 b2 ?; ?
Physical Examination
5 {! z6 o- W2 GThe physical examination revealed a very active,
" t3 w: s) d9 ?, v) g' F' aplayful, and healthy boy. The vital signs documented
- }, @: v' M! Ta blood pressure of 85/50 mm Hg, his length was
: |% Q! l0 j& X9 K2 P1 s8 G, Y90 cm (>97th percentile), and his weight was 14.4 kg. a5 r4 d0 Y' y7 d2 X' x
(also >97th percentile). The observed yearly growth
o2 L; ~$ n' F0 E- z' E7 D: nvelocity was 30 cm (12 inches). The examination of6 S$ b5 }& u; s q8 t7 [' d' X
the neck revealed no thyroid enlargement./ {8 C V. u/ t" h$ w6 K/ S
The genitourinary examination was remarkable for
: S+ m$ R6 H1 m9 Renlargement of the penis, with a stretched length of
: r. G E& q7 j4 p: z+ A+ w1 A$ m7 u8 cm and a width of 2 cm. The glans penis was very well x! A% E. }! f a% C, X
developed. The pubic hair was Tanner II, mostly around
8 O0 g( U+ z5 w% y1 p& M540
. H/ }% O1 P3 R7 A& n% L2 Bat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from6 {2 B( Y6 {6 l9 d
the base of the phallus and was dark and curled. The
8 y# O( J, F" l$ r0 `! ktesticular volume was prepubertal at 2 mL each.1 ~$ Q' p) @6 Q2 Z9 W
The skin was moist and smooth and somewhat5 n9 l/ R' d. c7 e" G) h: o! I1 v
oily. No axillary hair was noted. There were no
$ S' x" i5 B# X6 F" Oabnormal skin pigmentations or café-au-lait spots.
+ j P/ S7 ^# [Neurologic evaluation showed deep tendon reflex 2+; r. i( j; H# ]* S# x
bilateral and symmetrical. There was no suggestion
' Y+ F6 F2 f. T7 l+ s4 oof papilledema.
) s) H @* {& R( ]1 e* JLaboratory Evaluation
! L/ E- e# j% DThe bone age was consistent with 28 months by
% I2 F N+ l5 T1 nusing the standard of Greulich and Pyle at a chrono-
4 w% I" R# o J( G$ ]logic age of 16 months (advanced).5 Chromosomal
: S# Z' h" @# \1 n4 d5 _3 akaryotype was 46XY. The thyroid function test3 w) I/ g- n3 M; Z
showed a free T4 of 1.69 ng/dL, and thyroid stimu-, `! u* O' }- ?* ~
lating hormone level was 1.3 µIU/mL (both normal).
- Y* p3 ~( C7 H0 aThe concentrations of serum electrolytes, blood& `+ |. L( q' M: t6 K
urea nitrogen, creatinine, and calcium all were! S: k9 a* P2 f' @( H
within normal range for his age. The concentration, j7 X) n6 l/ s. R
of serum 17-hydroxyprogesterone was 16 ng/dL
: {: R6 b. p# n! f1 x- z8 G(normal, 3 to 90 ng/dL), androstenedione was 204 W4 P% G3 `. N3 Z/ C# O
ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-
) ~, [% q8 y& R7 w) y+ zterone was 38 ng/dL (normal, 50 to 760 ng/dL),' ?/ |1 I2 v0 F. m" D) B( j
desoxycorticosterone was 4.3 ng/dL (normal, 7 to' H5 S' ^$ Z' {! i
49ng/dL), 11-desoxycortisol (specific compound S)
9 P; f- D' P& u* |6 J9 Uwas 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-
5 P# \; W7 _1 Z+ N9 mtisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total# J7 B8 Q$ _+ i" R! O1 G+ Q
testosterone was 60 ng/dL (normal <3 to 10 ng/dL),
1 B& n) [. Q9 M3 b7 {- e3 Jand β-human chorionic gonadotropin was less than$ l* t( M4 F7 i( q
5 mIU/mL (normal <5 mIU/mL). Serum follicular$ E; p0 M, a" v" ]8 T' I- i8 Z( Q0 D
stimulating hormone and leuteinizing hormone3 U2 O" x4 } `! }( K) q
concentrations were less than 0.05 mIU/mL- n1 Z" x1 c' b$ h
(prepubertal).
3 t0 S: Q$ O7 L/ U* KThe parents were notified about the laboratory
+ l1 b u6 q5 a {0 O u' |results and were informed that all of the tests were! v0 _# s0 a8 d+ x; J
normal except the testosterone level was high. The& t# E% O; x M* H1 ~8 y& q
follow-up visit was arranged within a few weeks to
; Z) c* Y* ^. P1 r3 t+ @+ zobtain testicular and abdominal sonograms; how-
7 ^1 i* {) i3 iever, the family did not return for 4 months.5 S, \1 o. u7 E+ S: m
Physical examination at this time revealed that the
1 K6 r% Y8 X4 z P1 o1 E$ \child had grown 2.5 cm in 4 months and had gained9 u# u$ [ J3 s \; |' Z' Y
2 kg of weight. Physical examination remained* P$ F0 L0 P; q# \) a
unchanged. Surprisingly, the pubic hair almost com-
3 O- N. L4 K" C6 Xpletely disappeared except for a few vellous hairs at$ f# H8 k3 `8 L. b8 V0 {
the base of the phallus. Testicular volume was still 2
3 @- @+ T7 O' i' N g( U) ?( HmL, and the size of the penis remained unchanged.
; O0 d% J) X3 C9 r! V+ U/ jThe mother also said that the boy was no longer hav-9 d8 G, d. I/ a" T
ing frequent erections.
: \, A) @% Q; M# X5 }Both parents were again questioned about use of7 ? B- X- n) @, Z+ Y8 T
any ointment/creams that they may have applied to
5 i% B8 _, F C1 Athe child’s skin. This time the father admitted the0 H- |# S3 K, C- V7 V
Topical Testosterone Exposure / Bhowmick et al 5418 m2 [/ y+ Y. j1 b
use of testosterone gel twice daily that he was apply-- ?, q8 x0 W0 n3 d8 X0 C0 T
ing over his own shoulders, chest, and back area for4 W# W8 p. U$ U4 ?* b+ S
a year. The father also revealed he was embarrassed
1 {9 A" v# n: E' uto disclose that he was using a testosterone gel pre-( A5 w8 g' n7 G' Y7 h0 Y, r
scribed by his family physician for decreased libido; d7 H% W p& i# `# q* e9 `1 a! B
secondary to depression.# b7 y( F6 P$ S
The child slept in the same bed with parents.! U" `/ m, C3 d( E& m% Q+ Y
The father would hug the baby and hold him on his! u% h7 T2 p% w8 d; K" T
chest for a considerable period of time, causing sig-
: T. N: |$ \$ M5 c9 {4 N" ?0 Pnificant bare skin contact between baby and father.9 c* [0 A* y# e: r; [ g
The father also admitted that after the phone call,
0 z: v$ o3 [9 @) J* ~6 W* rwhen he learned the testosterone level in the baby
0 }& r) Q& C) Z9 `was high, he then read the product information
9 }$ M, B1 V. u1 Z6 s% h vpacket and concluded that it was most likely the rea-/ [* |- F2 ^0 L9 q4 |
son for the child’s virilization. At that time, they
?: X& e# `) H& r; z3 ^2 \ ^2 tdecided to put the baby in a separate bed, and the
& K& |& w( e7 z& @ bfather was not hugging him with bare skin and had
3 E) Q- A; W! ybeen using protective clothing. A repeat testosterone
4 I2 c% f u, U& T5 ]test was ordered, but the family did not go to the
5 A- q9 j: L, O8 A: ylaboratory to obtain the test.; u; M& q5 x/ F Z$ ]- m# a
Discussion8 f% q& B* m! E
Precocious puberty in boys is defined as secondary# N3 ~5 k6 q8 R; q8 x
sexual development before 9 years of age.1,4
0 S0 M3 m6 C" J4 z( rPrecocious puberty is termed as central (true) when2 W* M; v- H# p" a: ?
it is caused by the premature activation of hypo-
% K% g% |. j7 s J( pthalamic pituitary gonadal axis. CPP is more com-
: N$ O1 C3 ?5 Z' [2 l8 o' Jmon in girls than in boys.1,3 Most boys with CPP
; t: I1 N- w L4 B( Amay have a central nervous system lesion that is% E4 x! C+ p+ Z$ ]5 x
responsible for the early activation of the hypothal-
( w: m! U$ X0 _7 h5 bamic pituitary gonadal axis.1-3 Thus, greater empha-
8 h \: [1 S: Fsis has been given to neuroradiologic imaging in
6 O- v3 U, S) L0 {boys with precocious puberty. In addition to viril-+ N& a. C% V4 X& m( }4 L
ization, the clinical hallmark of CPP is the symmet-8 @" K6 z! J4 O, h
rical testicular growth secondary to stimulation by
& m A% h9 K# B3 `7 Bgonadotropins.1,3
. }, k% ~1 m# e# {* aGonadotropin-independent peripheral preco-2 t2 ~$ q" F: B+ E' i4 \
cious puberty in boys also results from inappropriate
/ Z( H& X; {5 Handrogenic stimulation from either endogenous or9 E% V& J F1 O* k; K3 q
exogenous sources, nonpituitary gonadotropin stim-
4 R9 L2 H+ P5 j% ~: _! Culation, and rare activating mutations.3 Virilizing
$ m; B- S# S5 qcongenital adrenal hyperplasia producing excessive
6 K# B# k/ j, Y( O) ]8 |adrenal androgens is a common cause of precocious
* I; z& M0 S4 Wpuberty in boys.3,4+ @4 |: o3 C Z$ s0 t; [: ?) D$ T
The most common form of congenital adrenal* p4 ?) a0 }: k# V7 R
hyperplasia is the 21-hydroxylase enzyme deficiency.* z' o. A e, J. e
The 11-β hydroxylase deficiency may also result in5 G. D$ R4 I; I& ?2 F2 B
excessive adrenal androgen production, and rarely,. v I5 O3 F& y; Y, s: F
an adrenal tumor may also cause adrenal androgen' l+ T3 Y; }0 O5 C2 r
excess.1,3
1 x+ O. O% D0 \* N+ \2 ~at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
! K: a7 l+ f( R: L542 Clinical Pediatrics / Vol. 46, No. 6, July 2007$ n& K* Y2 U v) v0 k
A unique entity of male-limited gonadotropin-
; Z! Q; k$ g5 E5 S; [independent precocious puberty, which is also known
% ]3 F1 `* s- v+ O6 Zas testotoxicosis, may cause precocious puberty at a
5 Y; R) F8 ^/ t; ~very young age. The physical findings in these boys
6 K" k9 s4 g0 t/ j8 G, [% w' w- P0 a" c7 qwith this disorder are full pubertal development,
4 g( k8 |0 J) V* b7 ~including bilateral testicular growth, similar to boys
: j9 d2 l4 Y1 \4 i- `) ^) @7 Q0 i: mwith CPP. The gonadotropin levels in this disorder
! S3 W0 l$ B- [ o) Kare suppressed to prepubertal levels and do not show" M$ c1 v" b+ R# s. @4 Q/ E
pubertal response of gonadotropin after gonadotropin-
: C# e3 G3 k! [" s+ L1 Hreleasing hormone stimulation. This is a sex-linked6 g C, W4 G! Q
autosomal dominant disorder that affects only7 G2 v. `3 Q) N5 F2 i1 J
males; therefore, other male members of the family+ E+ O2 p7 T& @0 I0 e
may have similar precocious puberty.3
$ m4 _/ a% H, C3 O0 JIn our patient, physical examination was incon-+ W% X/ o5 B* O2 k5 E
sistent with true precocious puberty since his testi-# W# |$ ^- W5 k/ d
cles were prepubertal in size. However, testotoxicosis; h( ?0 j9 i# n- c6 c7 c" S H
was in the differential diagnosis because his father2 c$ W5 P# D4 K9 X. x
started puberty somewhat early, and occasionally,: I9 u) M3 u& x7 P
testicular enlargement is not that evident in the" c( ^) O. Y' h% n: x
beginning of this process.1 In the absence of a neg-3 q$ O6 P! @6 w$ j! l* g
ative initial history of androgen exposure, our
! ]( {) h9 z; R; X6 l* s- Hbiggest concern was virilizing adrenal hyperplasia,3 m, j' t& l, Q* Z3 }
either 21-hydroxylase deficiency or 11-β hydroxylase
9 F4 s7 }1 v( i: Edeficiency. Those diagnoses were excluded by find-
, W3 ^$ c- K, r, t# d) Aing the normal level of adrenal steroids.
+ @7 I7 H! a6 P M+ b1 `# }The diagnosis of exogenous androgens was strongly3 d. V3 l% [" ? j5 ]/ Q
suspected in a follow-up visit after 4 months because: X4 e; M3 Z4 d/ C! q. C5 Q! S: Q
the physical examination revealed the complete disap-
' U1 F, m) \' }( k" ?! a3 f; \7 M' Ypearance of pubic hair, normal growth velocity, and
' |/ v6 ]% M$ Z4 d5 {& xdecreased erections. The father admitted using a testos-
4 _7 G+ `7 M5 z% Vterone gel, which he concealed at first visit. He was3 @. p- _7 e3 J: e/ u5 t
using it rather frequently, twice a day. The Physicians’
* v/ n" Z ?( VDesk Reference, or package insert of this product, gel or; Z7 l7 y R- u) [; ~3 F
cream, cautions about dermal testosterone transfer to" r% T, S) \" U u
unprotected females through direct skin exposure.
% k: k/ ~2 S S. FSerum testosterone level was found to be 2 times the
6 t5 y. n" o9 G; J0 d5 A4 Obaseline value in those females who were exposed to
0 S; d0 e1 G6 u% |1 M9 _even 15 minutes of direct skin contact with their male0 ~$ {0 G! ~6 ~! k
partners.6 However, when a shirt covered the applica-+ g n9 C# w" O
tion site, this testosterone transfer was prevented.) Q+ _' m9 A4 E0 ^/ j# ` D: g
Our patient’s testosterone level was 60 ng/mL,8 {8 [4 K' D$ C; Z1 S/ a
which was clearly high. Some studies suggest that
& B1 q6 L; h0 ]dermal conversion of testosterone to dihydrotestos-
3 j; T6 k$ B1 B, M4 q2 B- J Wterone, which is a more potent metabolite, is more
( [) f( q- i; R, x9 j' u) n8 s* }active in young children exposed to testosterone- S+ I2 Z0 K3 \
exogenously7; however, we did not measure a dihy-+ t% V2 @9 E" S/ T5 s
drotestosterone level in our patient. In addition to& t9 ]1 y8 ^. N7 \
virilization, exposure to exogenous testosterone in
$ B+ S1 v4 \8 }8 h: {& _) d. pchildren results in an increase in growth velocity and, r. V" D0 r; K- B5 h- v% u: N8 f
advanced bone age, as seen in our patient.
; q; l4 q* o* |2 s$ ^" r' oThe long-term effect of androgen exposure during
/ {( ?7 t: |- H- f0 \) I5 Cearly childhood on pubertal development and final
7 I5 g* p) t" y- F/ Q1 Xadult height are not fully known and always remain
) q' k4 s$ I+ _a concern. Children treated with short-term testos-6 M- {) @, j1 K8 j! I
terone injection or topical androgen may exhibit some+ D8 P' H3 f4 V+ _3 q; c
acceleration of the skeletal maturation; however, after
9 [$ n& H. m3 |) O0 ?: X( ^' J$ rcessation of treatment, the rate of bone maturation
7 T$ t( P9 m) pdecelerates and gradually returns to normal.8,9
6 |3 O, y" H6 W0 hThere are conflicting reports and controversy) f! E: @) r; I$ j. G. s
over the effect of early androgen exposure on adult4 I1 h3 v# }( c9 B# F
penile length.10,11 Some reports suggest subnormal
. n8 t/ X. j) badult penile length, apparently because of downreg-2 Y: x9 {' H1 P% p n% L1 q
ulation of androgen receptor number.10,12 However,; ]2 d! r4 G% d/ ?6 \
Sutherland et al13 did not find a correlation between/ C! A, {( P6 Q6 k
childhood testosterone exposure and reduced adult
D0 ?- B( |/ ?: `( ^$ ipenile length in clinical studies.
, j0 } S1 r- V ^Nonetheless, we do not believe our patient is
6 {2 r T9 r! n. |) ~( D! pgoing to experience any of the untoward effects from/ Z# i) I' U6 _. W; U3 v% z
testosterone exposure as mentioned earlier because" z! n" ~; Z/ F, ]/ g9 I* b
the exposure was not for a prolonged period of time., r! T5 J4 C- |* F
Although the bone age was advanced at the time of
9 |& \+ n. d/ n! ^& {/ Adiagnosis, the child had a normal growth velocity at
8 T$ T: I2 d+ z5 t4 \2 R7 ithe follow-up visit. It is hoped that his final adult4 l- ~ u% h8 E. P1 e
height will not be affected.8 A0 {( {# |# q% s! C" x& |
Although rarely reported, the widespread avail-
1 U1 d% Z" m& g, v( @4 o/ ^+ A6 W lability of androgen products in our society may! I8 D" f& f" [, S- I: X
indeed cause more virilization in male or female& ~) w0 Q0 H1 ]! _* e6 O0 r
children than one would realize. Exposure to andro-) _" m0 W% @. ~8 w1 f1 n) L
gen products must be considered and specific ques-8 D. E2 q1 K* s
tioning about the use of a testosterone product or
" Q( R. e6 e, t1 W7 _* [( Z0 y* Tgel should be asked of the family members during
% d( ]+ u/ K, Q4 [/ h! O0 x8 v$ vthe evaluation of any children who present with vir-
9 }/ [/ R. s+ M+ Rilization or peripheral precocious puberty. The diag-4 f T4 _* j1 Y8 N. S8 O" b# m
nosis can be established by just a few tests and by
, C3 u7 c: ]' g: X6 a1 c8 }3 W( iappropriate history. The inability to obtain such a
8 L4 [7 ^: @+ M1 h' Yhistory, or failure to ask the specific questions, may+ u7 h& s+ e' R
result in extensive, unnecessary, and expensive
' ]' \: @1 p4 t B' `5 Cinvestigation. The primary care physician should be
' J0 ?% e0 H7 @+ uaware of this fact, because most of these children! \4 I; ? A6 C
may initially present in their practice. The Physicians’. c! }$ ]7 Z" r
Desk Reference and package insert should also put a
; P& H, D' \' D8 r$ K; e, Kwarning about the virilizing effect on a male or* [( i$ c* K! J; t8 X
female child who might come in contact with some-' M& N% o! `' v9 y2 V
one using any of these products.6 Z: J0 Q# b5 a Y) a! l7 X+ E- g
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Endocrinology. 2nd ed. Philadelphia, PA: WB Saunders;
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% ?6 }/ ?5 a' u2 w1 H Upuberty in children with tumours of the suprasellar pineal
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7 A( _/ t% j2 H" _! mexposure to testosterone. Pediatrics. 1999;104:e23.+ \$ M3 U x' ?: b3 t
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Stanford, CA: Stanford University Press; 1959.
' p' \5 P$ i, X' n# F& I' A6. Physicians’ Desk Reference. Androgel 1% testosterone,
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Economics Company, Inc; 2004:3239-3241.
. q2 p9 k; z# P [ I7. Klugo RC, Cerny JC. Response of micropenis to topical. o3 L0 M# h, T" [2 q
testosterone and gonadotropin. J Urol. 1978;119:
" o1 @* ]$ H( \; [% |7 a5 j667-668.
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