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is a significant concern for physicians. Central
6 {) f3 d7 [2 R: Rprecocious puberty (CPP), which is mediated# @8 O1 A0 _6 }
through the hypothalamic pituitary gonadal axis, has8 d9 ^ A( K, y8 H/ q
a higher incidence of organic central nervous system. T v! y- _3 G) d1 L. x$ R
lesions in boys.1,2 Virilization in boys, as manifested
& h- T7 C) T9 \( r2 w- Kby enlargement of the penis, development of pubic& B7 t: F* G$ C6 Q* }7 X6 M
hair, and facial acne without enlargement of testi-8 ~1 _+ K! a2 e. K9 a# J
cles, suggests peripheral or pseudopuberty.1-3 We. }% ~* ?8 u5 z0 O0 {6 ]3 X
report a 16-month-old boy who presented with the8 u1 X x, }" _7 _
enlargement of the phallus and pubic hair develop-
5 l! M: B9 H+ B; M+ [' N/ L+ Fment without testicular enlargement, which was due
7 J9 U2 y( H+ o% lto the unintentional exposure to androgen gel used by
5 E `$ S+ }$ F6 n- S5 }4 nthe father. The family initially concealed this infor-5 ^' w; H: }7 i! Q# Z0 W1 G! X3 A- [
mation, resulting in an extensive work-up for this5 d9 k& e! w9 o) `$ m( P
child. Given the widespread and easy availability of
# m$ @% b0 L3 r4 ~5 gtestosterone gel and cream, we believe this is proba-& [$ B6 g3 V5 V4 O! F# `
bly more common than the rare case report in the
1 s; U4 F# `8 |' v$ oliterature.4
1 R& _2 f! {5 b# K/ u- sPatient Report
0 q6 X( {9 N# v' |6 c, jA 16-month-old white child was referred to the# d3 I9 L3 L# F# o
endocrine clinic by his pediatrician with the concern
- \3 C$ y8 A2 zof early sexual development. His mother noticed
9 _ `3 L! t9 R! L, @light colored pubic hair development when he was/ u' B/ j$ E" l: m+ a
From the 1Division of Pediatric Endocrinology, 2University of
* e$ q# @$ S0 s" E; PSouth Alabama Medical Center, Mobile, Alabama.
( D0 D, l8 J5 W8 {! S: uAddress correspondence to: Samar K. Bhowmick, MD, FACE,
2 m) r# l. d" p1 a4 Q& xProfessor of Pediatrics, University of South Alabama, College of
- W4 Z. J7 q9 k1 i! e( SMedicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;
) b7 J: f! r4 M/ Q6 de-mail: [email protected].$ H7 D$ h# H/ m4 o. f |# y% f
about 6 to 7 months old, which progressively became5 c! W7 _% b) T
darker. She was also concerned about the enlarge-
! I* r* `5 Q+ rment of his penis and frequent erections. The child; O+ E0 H2 @1 U8 V+ c- ?, [
was the product of a full-term normal delivery, with
5 O0 g. @- C2 g H x- h Ia birth weight of 7 lb 14 oz, and birth length of6 C u7 C( l+ X1 l! Q {4 j
20 inches. He was breast-fed throughout the first year
5 d, G1 x9 G6 R1 Pof life and was still receiving breast milk along with( Q8 R% K- d/ F/ ~
solid food. He had no hospitalizations or surgery,
8 p& B) N# O( Pand his psychosocial and psychomotor development
4 O z' X& o/ Y. f9 pwas age appropriate.
, P M H2 K& e+ c: a' c2 eThe family history was remarkable for the father,8 g0 Y6 J! \: z8 \8 E F: Q
who was diagnosed with hypothyroidism at age 16,
# ^" P4 ?: s+ C3 L5 l5 _2 R% uwhich was treated with thyroxine. The father’s
* u7 e8 k4 g( s: q1 O5 Cheight was 6 feet, and he went through a somewhat! n5 m6 W; d) ~0 I _6 G: m
early puberty and had stopped growing by age 14.
6 S; h/ D8 s7 a% l3 p8 E. C! F; sThe father denied taking any other medication. The5 v _* K8 J( H" B5 a0 k: M& U
child’s mother was in good health. Her menarche
z t6 p1 U, B3 kwas at 11 years of age, and her height was at 5 feet& p3 B" \/ X- e& E9 S; j/ \4 t
5 inches. There was no other family history of pre-
1 w! g" z) U! G, l" O1 u2 s. gcocious sexual development in the first-degree rela-
) W5 q+ J4 r6 K2 Ytives. There were no siblings.
7 l8 T" R9 x! j+ F$ @' iPhysical Examination/ \4 m' p% m8 Q0 E0 u
The physical examination revealed a very active,
3 d( H8 O0 `' D' `5 n. b% G9 vplayful, and healthy boy. The vital signs documented& s2 Z2 @3 J1 d# ~1 A
a blood pressure of 85/50 mm Hg, his length was
! [, L( X! ?8 \: ]- Y) p. z90 cm (>97th percentile), and his weight was 14.4 kg
3 h) o( C! F2 ?- U/ X- Y* ?( M(also >97th percentile). The observed yearly growth
6 K7 _ U9 y" |8 w) ~$ ?' uvelocity was 30 cm (12 inches). The examination of9 v! U: B& S! r$ p: ^. N
the neck revealed no thyroid enlargement.
) k7 U" E, G1 o% I; H' G: rThe genitourinary examination was remarkable for
2 m3 R* ]# ], {% d! Denlargement of the penis, with a stretched length of
! f% O. X/ Z9 T. D) {/ c8 cm and a width of 2 cm. The glans penis was very well
( ?1 B9 e9 n; G$ {9 b9 e( [developed. The pubic hair was Tanner II, mostly around! b% m4 Z* X! J, |- ]7 [, T
540
2 ~0 [; \: u8 ~5 [* fat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
. | _1 ^: C% {6 I6 tthe base of the phallus and was dark and curled. The1 H5 _/ f2 I, a, o" ~ {
testicular volume was prepubertal at 2 mL each.7 W! M. D5 \: }: t6 d4 d7 D3 H# M
The skin was moist and smooth and somewhat# |" P1 N, v/ m$ T+ {! m f3 i
oily. No axillary hair was noted. There were no
+ a8 e. q& c) j0 r6 `$ a9 E0 K4 Iabnormal skin pigmentations or café-au-lait spots.
9 Q/ [) V7 K, N @; ONeurologic evaluation showed deep tendon reflex 2+/ A$ m4 e% B2 o7 c* b
bilateral and symmetrical. There was no suggestion o: r2 |, x. L. r( R# V8 o
of papilledema.7 E5 q3 [2 p5 X* r
Laboratory Evaluation4 ?4 ^% I2 B& X! W
The bone age was consistent with 28 months by
4 @, P+ D& _& y0 {! susing the standard of Greulich and Pyle at a chrono-: S# [& b1 V! |: N" G) r& h
logic age of 16 months (advanced).5 Chromosomal& T) C4 I5 N0 ^
karyotype was 46XY. The thyroid function test) q9 P; m/ R9 l2 i" c0 j# o
showed a free T4 of 1.69 ng/dL, and thyroid stimu-" S" U4 V/ {# Z& {& f
lating hormone level was 1.3 µIU/mL (both normal).
& x' \" n9 c1 u" f9 |The concentrations of serum electrolytes, blood9 k7 Q2 N3 _- R7 O9 W6 S/ c
urea nitrogen, creatinine, and calcium all were% n/ [* X+ R! p1 X3 Z' u
within normal range for his age. The concentration2 j( C1 [9 Z# n4 C( O& n
of serum 17-hydroxyprogesterone was 16 ng/dL
- e+ Z% A' u/ H4 D" I7 p3 T% X(normal, 3 to 90 ng/dL), androstenedione was 20- w) @* {! b: M }0 w: s
ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-
a2 ]% q) }# ^/ q9 K+ R, a, `( Yterone was 38 ng/dL (normal, 50 to 760 ng/dL),0 j$ G9 C' e5 g
desoxycorticosterone was 4.3 ng/dL (normal, 7 to
' S0 r k: |) g3 f6 g49ng/dL), 11-desoxycortisol (specific compound S); V% s& k. d* ]- d# \' m, Q, [
was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-
4 A; c7 Y( Y) [. a7 C/ atisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total: E" o8 X7 D: ?* m* r( Y1 a
testosterone was 60 ng/dL (normal <3 to 10 ng/dL),1 [+ U1 {2 f* A6 w
and β-human chorionic gonadotropin was less than
7 j: B! A+ @! p7 v5 mIU/mL (normal <5 mIU/mL). Serum follicular
% H: H3 |- H, W$ k: C9 _stimulating hormone and leuteinizing hormone' p7 |, a& B4 G8 M" c' R6 k4 s
concentrations were less than 0.05 mIU/mL
% x! p8 [' u& Q7 T. N) d4 F(prepubertal).
8 i- m' ?) w- a+ W! B1 z& U2 {The parents were notified about the laboratory
9 ~# ~ K1 A1 E6 Q# K3 T2 Vresults and were informed that all of the tests were
5 T5 ^: C; v2 Jnormal except the testosterone level was high. The# ~* X8 j6 h; F
follow-up visit was arranged within a few weeks to
$ n( @: A$ _# q: Eobtain testicular and abdominal sonograms; how-( j, m. T# {3 |) o
ever, the family did not return for 4 months.$ B4 J2 O) x& Y
Physical examination at this time revealed that the
6 Q% I3 o2 D7 x O4 Zchild had grown 2.5 cm in 4 months and had gained9 D) ^- w" j: \ W7 h# ^. _4 v) g
2 kg of weight. Physical examination remained3 n9 f! C* B2 Z& t3 Q
unchanged. Surprisingly, the pubic hair almost com-0 ]0 ]# Z0 Y- D
pletely disappeared except for a few vellous hairs at
& K8 E* o6 S. K5 H) C& othe base of the phallus. Testicular volume was still 2
: N7 z2 L' u9 x nmL, and the size of the penis remained unchanged.' @3 T; ]! G$ u7 ?: {- _
The mother also said that the boy was no longer hav-
1 W% |0 |& ^$ `; b/ Hing frequent erections.
0 G6 C6 |5 U+ z8 a. e+ ^& ^Both parents were again questioned about use of
5 Z% E0 i: q( w( h( r7 E$ Jany ointment/creams that they may have applied to8 ^* Q& H; i9 ?0 A
the child’s skin. This time the father admitted the
8 Q6 x# [/ `- `2 @Topical Testosterone Exposure / Bhowmick et al 541
# U+ P* ^; X# B" w4 K; }use of testosterone gel twice daily that he was apply-
- p; ?; M0 o b% U; wing over his own shoulders, chest, and back area for6 E, M1 S2 Y5 [ U4 t( r
a year. The father also revealed he was embarrassed# x- T% f7 h6 Z5 m
to disclose that he was using a testosterone gel pre-
$ S8 t4 W' D' k) Rscribed by his family physician for decreased libido8 C2 ?; R) P/ Y6 k+ n1 g7 ^1 S
secondary to depression.3 `! D) t( r f3 I: t8 T/ Q
The child slept in the same bed with parents.
# o5 L n# }3 M+ d R( W1 x3 l+ |The father would hug the baby and hold him on his
/ W: `. d+ K% D- ~& D! p: o9 |( wchest for a considerable period of time, causing sig-
" @, \9 v' \8 @$ r4 Anificant bare skin contact between baby and father.# J" n2 V8 Y) t% v4 C0 Z
The father also admitted that after the phone call,
' ^6 X$ a2 [0 q" |1 Wwhen he learned the testosterone level in the baby
; L0 R; S% e/ W9 d( i3 g, ewas high, he then read the product information% w6 y0 `& @) }- U6 e' ]
packet and concluded that it was most likely the rea-4 x8 O5 |! {8 J# a1 }7 |
son for the child’s virilization. At that time, they3 m# p/ u% C2 Q. F) F1 f* n5 K
decided to put the baby in a separate bed, and the Q" w2 [! q' {% G7 n& J5 n
father was not hugging him with bare skin and had
: A+ j# }5 G! a. ?& q& c: pbeen using protective clothing. A repeat testosterone
" { R# K% ?; N( Ktest was ordered, but the family did not go to the+ F, k: m3 d; A- O$ I* G4 w
laboratory to obtain the test.' N: X) R1 C( W& V S5 f
Discussion
! h2 l. M; U; M; a: SPrecocious puberty in boys is defined as secondary
" ^. g1 @ I, U" P! S" k+ Ssexual development before 9 years of age.1,4" P* z% Y" X7 q5 u2 `" g
Precocious puberty is termed as central (true) when1 O5 X6 d& i+ P( |& T s: E) J; @& \( J
it is caused by the premature activation of hypo-
, S& V1 D( `1 Dthalamic pituitary gonadal axis. CPP is more com-
; k) _' \7 i2 H# V! `7 |2 w9 Smon in girls than in boys.1,3 Most boys with CPP
+ W* D' T; K: P$ lmay have a central nervous system lesion that is
2 d! K7 L. G$ [8 w8 P+ ?: Wresponsible for the early activation of the hypothal-
3 ^% |2 a* B$ L- [amic pituitary gonadal axis.1-3 Thus, greater empha-+ Z& y, n" D( T
sis has been given to neuroradiologic imaging in& X) A' ^* [% A$ W
boys with precocious puberty. In addition to viril-
4 L7 w2 s9 S) v3 |& J0 e3 tization, the clinical hallmark of CPP is the symmet-7 V, K8 h2 P0 b L/ Y
rical testicular growth secondary to stimulation by: |5 F0 c$ {* a( b
gonadotropins.1,31 L" r: V- r& N( r" P( D
Gonadotropin-independent peripheral preco-" V; z5 A8 E4 @1 N
cious puberty in boys also results from inappropriate( P% n Y0 T, c+ A- Z
androgenic stimulation from either endogenous or
- E* c( S8 d8 o* J8 T6 ]exogenous sources, nonpituitary gonadotropin stim-* M' ^* z; G t& @
ulation, and rare activating mutations.3 Virilizing
& }/ f1 ~7 d5 o) G* T* U. y3 {- pcongenital adrenal hyperplasia producing excessive
, G8 M- u* |( @6 c; _) E2 v3 c. ?+ Badrenal androgens is a common cause of precocious
& B0 C* n% x; vpuberty in boys.3,4/ v- \8 C6 J* \/ b5 I6 Y
The most common form of congenital adrenal
2 P ?* N4 ]+ q: c% dhyperplasia is the 21-hydroxylase enzyme deficiency.; N; p7 v) T$ D
The 11-β hydroxylase deficiency may also result in
& P9 a2 G9 A# t- }excessive adrenal androgen production, and rarely,
, X' Y7 N7 }( {& \an adrenal tumor may also cause adrenal androgen" F6 {, b) F% i' Y+ R
excess.1,3# |, m( C7 ?' Y7 ~* Y5 ^
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from* W" {9 `/ j9 U# H4 Y8 a. G
542 Clinical Pediatrics / Vol. 46, No. 6, July 2007
% B: k; I0 B e; AA unique entity of male-limited gonadotropin-' c7 y9 l$ a( @/ r2 Q7 k0 j
independent precocious puberty, which is also known' h* H% [9 H% Q! X
as testotoxicosis, may cause precocious puberty at a& M8 d9 G1 T' c( k
very young age. The physical findings in these boys7 B& L2 u: M5 x+ @/ ^6 b3 s
with this disorder are full pubertal development,
7 b3 v* k0 j' A0 s: rincluding bilateral testicular growth, similar to boys
- d$ C5 y/ u; A+ n9 ^1 {& xwith CPP. The gonadotropin levels in this disorder2 t# C. x7 w/ X1 ^
are suppressed to prepubertal levels and do not show1 J% `: F" p, J5 q- _7 l
pubertal response of gonadotropin after gonadotropin-
( r/ h; f, E) z) D- Treleasing hormone stimulation. This is a sex-linked y% E% t; N4 Q. W
autosomal dominant disorder that affects only) S: r6 L3 b& ]5 [# `$ v
males; therefore, other male members of the family& J& v; g5 C, {0 r: s$ ^) z
may have similar precocious puberty.3 Q3 J& v0 I$ v; p9 s5 J: X
In our patient, physical examination was incon-' l6 W# M9 }% n2 O
sistent with true precocious puberty since his testi-; S% L- \) @; n8 H1 }1 b
cles were prepubertal in size. However, testotoxicosis# l. W) ~5 h2 g, n( v; [ L. h
was in the differential diagnosis because his father' ?3 _1 r2 `, s% k- b, P p
started puberty somewhat early, and occasionally,4 u0 f# T) f2 v2 s
testicular enlargement is not that evident in the
* A$ C7 v9 l- z$ Z2 J4 P. hbeginning of this process.1 In the absence of a neg-" U1 _9 Q- r$ {# W
ative initial history of androgen exposure, our
' M) L) D6 c) `; K% ?biggest concern was virilizing adrenal hyperplasia,; L5 M4 T/ k+ e7 m3 {
either 21-hydroxylase deficiency or 11-β hydroxylase; {" K5 Z W, y
deficiency. Those diagnoses were excluded by find-) p3 ]4 Z7 t% k) f$ x
ing the normal level of adrenal steroids.
7 l6 t1 K7 [, s. U) Z2 u4 V7 e8 YThe diagnosis of exogenous androgens was strongly0 z, F% _9 Z4 r! O( z
suspected in a follow-up visit after 4 months because
0 p) v8 m/ }1 p* othe physical examination revealed the complete disap-' k+ ?2 w, F! G$ M
pearance of pubic hair, normal growth velocity, and' |. ]; `# o' h* E: N! [! h0 h4 r
decreased erections. The father admitted using a testos-& A! w/ i( X. x7 `3 O
terone gel, which he concealed at first visit. He was
1 H0 @. C( O) U& o1 h% }8 H/ yusing it rather frequently, twice a day. The Physicians’
& B5 r) Q" _/ zDesk Reference, or package insert of this product, gel or ~6 Q: C* ^' {% s, G/ y
cream, cautions about dermal testosterone transfer to
. `, k: n; D- Runprotected females through direct skin exposure.
* x2 U2 \( V) e9 q8 S* ~. R; C& LSerum testosterone level was found to be 2 times the
2 ^ V. J4 N0 j, v* m- g4 ebaseline value in those females who were exposed to
( A& n8 u, p$ I+ K9 [, z6 qeven 15 minutes of direct skin contact with their male* J/ _# t7 y" j1 n5 u
partners.6 However, when a shirt covered the applica-2 o) ^9 Q) A, [- r1 t
tion site, this testosterone transfer was prevented.6 ^/ ]' V1 a9 E' G1 S% I0 }
Our patient’s testosterone level was 60 ng/mL,2 A+ S* |0 C, U
which was clearly high. Some studies suggest that
$ C8 M$ L* j3 d y4 j5 Y; Jdermal conversion of testosterone to dihydrotestos-) ]0 B5 y7 G6 j% \) ~
terone, which is a more potent metabolite, is more
7 }: e- y. @7 ]7 Y5 Cactive in young children exposed to testosterone
! }7 T/ M5 d! G+ g% d( k8 g. [exogenously7; however, we did not measure a dihy-$ ~$ u3 J: a% z5 O Y. |- ~0 h
drotestosterone level in our patient. In addition to* F$ ]/ ~: Y; a- ]+ Q4 u( F' X
virilization, exposure to exogenous testosterone in* v" [3 n# n1 A, V! {+ i
children results in an increase in growth velocity and U+ n# A; V% G$ T3 ]; C R! t
advanced bone age, as seen in our patient./ Y7 w# a1 G/ G- e9 W. ~
The long-term effect of androgen exposure during/ F4 V# k E( f5 a9 f+ k& x
early childhood on pubertal development and final8 P/ z2 ~4 x! M
adult height are not fully known and always remain4 B+ \: k2 q( p) n2 f. X) L
a concern. Children treated with short-term testos-- W: m1 B3 r/ W) B9 Z1 b, g( u- H
terone injection or topical androgen may exhibit some- g. W) r1 T) s
acceleration of the skeletal maturation; however, after
1 w) [3 g8 t0 hcessation of treatment, the rate of bone maturation
7 e" X; P: d1 D. Zdecelerates and gradually returns to normal.8,90 T0 M, X. H4 P2 `! E$ N3 ]1 e
There are conflicting reports and controversy' `2 I! }' J4 f& D- a) v" }
over the effect of early androgen exposure on adult; q9 q1 ^, B8 `/ ]3 b$ H& v
penile length.10,11 Some reports suggest subnormal% H! _( l, C; X# B3 u O
adult penile length, apparently because of downreg-4 r) c. z5 P5 h' h
ulation of androgen receptor number.10,12 However,
7 E7 I) X* x( o& ]. PSutherland et al13 did not find a correlation between
* n" B( s( m9 |; ichildhood testosterone exposure and reduced adult) L; v9 c% D- G8 Z$ G- f; }
penile length in clinical studies.
7 F0 j+ ^5 `* d" ?; K& A0 r' l/ D; bNonetheless, we do not believe our patient is
( o% `# p" @8 D; Zgoing to experience any of the untoward effects from: t2 _% n `6 \5 G
testosterone exposure as mentioned earlier because
5 r$ o; ^+ y- K) t0 ?# N$ s- rthe exposure was not for a prolonged period of time.
9 L/ g+ L- N" Z# r% iAlthough the bone age was advanced at the time of
, ~$ v7 J- w Q. x$ \* J$ sdiagnosis, the child had a normal growth velocity at7 W7 L' a5 k, r5 I6 y, {
the follow-up visit. It is hoped that his final adult; o/ g! I1 v# [( h4 n
height will not be affected.
( m7 B+ e1 P3 f' q! s' L0 P0 HAlthough rarely reported, the widespread avail-
( f# S8 u6 u5 Y1 t" D% Zability of androgen products in our society may/ H; @& v8 q. w* v6 Y
indeed cause more virilization in male or female8 M1 G5 e% S) G' a. Z
children than one would realize. Exposure to andro-
' f! M# Y8 l( h& S" R+ ~gen products must be considered and specific ques-
0 C1 f! v1 x3 ^" xtioning about the use of a testosterone product or9 m8 H' P' O" U" R' e
gel should be asked of the family members during0 d. l- V+ g8 V
the evaluation of any children who present with vir-$ o! G! _& \5 n' p/ `4 J
ilization or peripheral precocious puberty. The diag-5 I% Y+ n: {' O5 p+ I
nosis can be established by just a few tests and by
, s) H0 _) s8 ]2 M) P8 oappropriate history. The inability to obtain such a' ]) g- p0 P* {; s' o: S
history, or failure to ask the specific questions, may' W' r, c+ o. ? E) E, t( `
result in extensive, unnecessary, and expensive9 [ ?9 P$ V1 W! Q
investigation. The primary care physician should be
$ j; |0 d _- }0 n: M! T% \4 Zaware of this fact, because most of these children
& i; ?+ Z5 m7 Vmay initially present in their practice. The Physicians’
- u& {. A* n2 A( W( p6 LDesk Reference and package insert should also put a
8 ]5 H5 q" ^' G, f7 ~* B; R+ }% vwarning about the virilizing effect on a male or: G0 m# |: G P+ J# q
female child who might come in contact with some-* l( C- _- [* i+ L
one using any of these products.; ?8 }% \2 W7 }& ^; M
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. k$ k! q( B2 L2 LDekker Inc; 2003:211-238.
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Economics Company, Inc; 2004:3239-3241.9 Q2 v$ H$ a" R* P- |
7. Klugo RC, Cerny JC. Response of micropenis to topical; G8 a3 b a/ g, l- H
testosterone and gonadotropin. J Urol. 1978;119:
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